Tunable add/drop filter
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United States of America Patent
Stats
-
Dec 24, 2002
Grant Date -
Jun 7, 2001
app pub date -
Jun 28, 1999
filing date -
Dec 28, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An inexpensive and efficient tunable electromagnetic filter is disclosed, having a wide range of tunable frequencies, comprising a holder with a number of filters mounted on the holder. The frequency of the filter is altered by moving the holder relative to a beam striking the holder so that one of the filters is filtering the beam. The frequency to be filtered may be easily and quickly changed, without altering the structure of the filter. In one embodiment the tunable filter is a disk rotatable by a motor with a number of fixed frequency filters mounted around the periphery of the disk. The filter is surrounded by four fibers providing and receiving beams, as with known add-drop filters.
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